首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4293篇
  免费   34篇
教育   3052篇
科学研究   349篇
各国文化   62篇
体育   377篇
综合类   2篇
文化理论   51篇
信息传播   434篇
  2022年   21篇
  2021年   42篇
  2020年   77篇
  2019年   122篇
  2018年   137篇
  2017年   130篇
  2016年   120篇
  2015年   81篇
  2014年   124篇
  2013年   974篇
  2012年   105篇
  2011年   112篇
  2010年   90篇
  2009年   99篇
  2008年   92篇
  2007年   86篇
  2006年   105篇
  2005年   92篇
  2004年   80篇
  2003年   86篇
  2002年   60篇
  2001年   61篇
  2000年   76篇
  1999年   62篇
  1998年   62篇
  1997年   52篇
  1996年   52篇
  1995年   41篇
  1994年   43篇
  1993年   49篇
  1992年   41篇
  1991年   47篇
  1990年   47篇
  1989年   48篇
  1988年   51篇
  1987年   45篇
  1986年   38篇
  1985年   39篇
  1984年   38篇
  1983年   44篇
  1982年   31篇
  1981年   25篇
  1980年   27篇
  1979年   42篇
  1978年   41篇
  1977年   31篇
  1976年   34篇
  1974年   25篇
  1973年   26篇
  1969年   19篇
排序方式: 共有4327条查询结果,搜索用时 15 毫秒
81.
Long-Evans rats were trained on an easy simultaneous discrimination problem and then transferred to a hard discrimination problem. The discriminanda were different orientations of stripes. In Experiment I, transfer was intradimensional with stimulus generalization controlled. The easy-to-hard effect was not found. In Experiment II transfer was intradimensional and either compatible (nonreversal) or incompatible (reversal). With compatible transfer, rats trained on a prior easy problem learned the hard problem faster than rats trained only on the hard problem. Persistent negative transfer was found with incompatible transfer. Attention was not supported as underlying the easy-to-hard effect. Explanations based on specific sources of intradimensional transfer, such as stimulus generalization or adaptation level, are suggested.  相似文献   
82.
Balancing self-care and other-care is often a struggle for career counselors and others in the helping professions. The process of caring is made up of a constant series of empathic attachments, active involvements, and felt separations. The ability to continually engage in the caring cycle is important for success. However, the constant need to re-create the cycle of caring can lead to counselor depletion and burnout. This article provides a developmental framework for assisting career counselors to avoid depleted caring while prolonging their professional longevity. The model of self-care includes recognizing the hazards of high touch work, such as limited resources and constant one-way caring. Also addressed are specific means of professional and personal sustenance, such as maximizing experiences of professional success and balancing personal wellness throughout one's career.  相似文献   
83.
84.
Research on technological opportunity has typically focused on the impact of broad industry characteristics on R&D intensity of firms. This study complements such approaches by examining the impact of a multidimensional vector that measures technological opportunity on independent inventors’ decisions to patent and commercialize inventions. Using data from 559 inventions and controlling for demand, appropriability, and competitive conditions, we found two of four tested dimensions of technological opportunity - technical performance and technical uncertainty - to be significant and important determinants of the likelihood of commercialization. Technical feasibility appears important in affecting patenting but unimportant in affecting commercialization. Technical significance carries a negative, although insignificant, sign conditioning commercialization.  相似文献   
85.
Previous research has found that researchers rank journal reputation and impact factor (IF) amongst the key selection criteria when choosing where to submit. We explored the actual effect upon submission numbers of several possible factors. We retrieved 10 years of submission data from over a thousand journals, as well as data on IF, retractions, and other factors. We performed statistical analysis and identified correlations. We also undertook case study research on the 55 most significant submission decreases. We found a statistically significant correlation between changes in IF, ISI percentage ranking, and changes in submissions numbers in subsequent years. We also found a statistically significant effect on submission numbers in the year following the publication of a retraction. Our case studies identified other factors, including negative feedback on the peer review process. Our findings regarding IF confirm previous indications about the significance of IF on submissions. We explain the correlation with retractions through the concept of ‘peer review reputation’. These results indicate that editors and publishers need to focus on a journal's peer review practices, as well as a journal's IF, if they are to maintain and grow submissions.  相似文献   
86.
87.
This article examines the constraints of modern temporality which are antithetical to the careful consideration that working with diverse learners requires for the development of inclusive, democratic education. We take up the conceptual construct of time to explore how it mediates systemic practices that impact policy positions of inclusion in initial teacher education and schooling. Our analysis demonstrates that temporality shapes the possibilities of inclusive practice within which a dominant agenda of compliance frames classroom complexities – both in schooling and higher education environments – into fragmented and preconceived responses to challenging situations. Education systems position educators in risk discourses concentrated on compliance and performance, in part through an emphasis that is placed on the diagnosis of learner differences and subsequent compartmentalised responses. Through schisms in modern time, we demonstrate the ways in which inclusion, like other educational demands, may be supported through a diffraction in time rather than subjugated to it.  相似文献   
88.
89.
90.
威廉皇帝物理研究所(Kaiser Wilhelm Institut für Physik)正式成立于1917年10月,爱因斯坦是它的首任所长。研究所并没有一栋宏伟宽敞的建筑,其办公地点就设在这位著名所长的私人住房里。正如柏林的马普科学史研究所所长雷恩  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号